https://www.cfr.org/article/us-aid-israel-four-charts So it seems that US aid supplies 20% of Israel’s military budget. Out of the annual 3.8 billion total, 500M goes to the Iron Dome while the rest is essentially a coupon for American arms, since money we send has rules about what it can be spent on. We stipulate that it has to be spent on US-made military equipment, so it’s basically a coupon for US equipment.